Answer on Other Chemistry Question for Saif Chachar

2012-12-27T08:14:44-0500

Question #21314

why do we find it useful to have two units for the amount of substance , the kilogram and mole ?

Expert's answer

2012-12-27T10:28:31-0500

Kilogram and mole measure different things. Kilogram is used to measure the mass, the mole is closely related to the number of particles. 1 mole of a substance always has (number of Avogadro) particles. Therefore, you can&#039;t say in general how many moles are in a kilogram, this depends on the substance. For example, a mole of hydrogen atoms has a mass of 1 gram, while a mole of oxygen atoms has a mass of 16 grams.

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